Ask HN: Which Macbook Pro will you buy? 13“ or 15”?

I am confused between 13" (with 16Gb RAM, 512G SSD, dual core i5 processor worth $1999) and 15" (with 16Gb RAM, 256G SSD and quad core i7 processor worth $1999) I will be doing web and mobile development, occasionally running a windows virtual machine, if needed.